SINUS  BRADYCARDIA
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  • R-R interval regular
  • QRS rate is decreased
  • P wave precedes each QRS complex
  • P wave axis is 0o-90o (with normal atrial situs)
  • P wave axis remains constant
  • PR interval is normal for child's age
  • PR interval remains constant
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  • Second degree AV block, third degree AV block
  • Junctional rhythm
  • Blocked premature atrial contraction